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<pre class="code"><code><span id="1" class="l"><span class="xlang">&lt;?php</span>
</span><span id="2" class="l"><span class="php-keyword1">namespace</span> LeanCloud\Operation;
</span><span id="3" class="l">
</span><span id="4" class="l"><span class="php-keyword1">use</span> LeanCloud\Operation\SetOperation;
</span><span id="5" class="l">
</span><span id="6" class="l"><span class="php-comment">/**
</span></span><span id="7" class="l"><span class="php-comment"> * Increment operation
</span></span><span id="8" class="l"><span class="php-comment"> */</span>
</span><span id="9" class="l">
</span><span id="10" class="l"><span class="php-keyword1">class</span> IncrementOperation <span class="php-keyword1">implements</span> IOperation {
</span><span id="11" class="l">    <span class="php-comment">/**
</span></span><span id="12" class="l"><span class="php-comment">     * The key of field the operation applies to
</span></span><span id="13" class="l"><span class="php-comment">     *
</span></span><span id="14" class="l"><span class="php-comment">     * @var string
</span></span><span id="15" class="l"><span class="php-comment">     */</span>
</span><span id="16" class="l">    <span class="php-keyword1">private</span> <span class="php-var">$key</span>;
</span><span id="17" class="l">
</span><span id="18" class="l">    <span class="php-comment">/**
</span></span><span id="19" class="l"><span class="php-comment">     * The value of operation
</span></span><span id="20" class="l"><span class="php-comment">     */</span>
</span><span id="21" class="l">    <span class="php-keyword1">private</span> <span class="php-var">$value</span>;
</span><span id="22" class="l">
</span><span id="23" class="l">    <span class="php-comment">/**
</span></span><span id="24" class="l"><span class="php-comment">     * Initialize operation
</span></span><span id="25" class="l"><span class="php-comment">     *
</span></span><span id="26" class="l"><span class="php-comment">     * @param string $key
</span></span><span id="27" class="l"><span class="php-comment">     * @param number $val
</span></span><span id="28" class="l"><span class="php-comment">     */</span>
</span><span id="29" class="l">    <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> __construct(<span class="php-var">$key</span>, <span class="php-var">$val</span>) {
</span><span id="30" class="l">        <span class="php-keyword1">if</span> (!<span class="php-keyword2">is_numeric</span>(<span class="php-var">$val</span>)) {
</span><span id="31" class="l">            <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> \InvalidArgumentException(<span class="php-quote">&quot;Operand must be number.&quot;</span>);
</span><span id="32" class="l">        }
</span><span id="33" class="l">        <span class="php-var">$this</span>-&gt;<span class="php-keyword2">key</span>   = <span class="php-var">$key</span>;
</span><span id="34" class="l">        <span class="php-var">$this</span>-&gt;value = <span class="php-var">$val</span>;
</span><span id="35" class="l">    }
</span><span id="36" class="l">
</span><span id="37" class="l">    <span class="php-comment">/**
</span></span><span id="38" class="l"><span class="php-comment">     * Get key of field the operation applies to
</span></span><span id="39" class="l"><span class="php-comment">     *
</span></span><span id="40" class="l"><span class="php-comment">     * @return string
</span></span><span id="41" class="l"><span class="php-comment">     */</span>
</span><span id="42" class="l">    <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getKey() {
</span><span id="43" class="l">        <span class="php-keyword1">return</span> <span class="php-var">$this</span>-&gt;<span class="php-keyword2">key</span>;
</span><span id="44" class="l">    }
</span><span id="45" class="l">
</span><span id="46" class="l">    <span class="php-comment">/**
</span></span><span id="47" class="l"><span class="php-comment">     * Get value of operation
</span></span><span id="48" class="l"><span class="php-comment">     *
</span></span><span id="49" class="l"><span class="php-comment">     * @return number
</span></span><span id="50" class="l"><span class="php-comment">     */</span>
</span><span id="51" class="l">    <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getValue() {
</span><span id="52" class="l">        <span class="php-keyword1">return</span> <span class="php-var">$this</span>-&gt;value;
</span><span id="53" class="l">    }
</span><span id="54" class="l">
</span><span id="55" class="l">    <span class="php-comment">/**
</span></span><span id="56" class="l"><span class="php-comment">     * Encode to JSON represented operation
</span></span><span id="57" class="l"><span class="php-comment">     *
</span></span><span id="58" class="l"><span class="php-comment">     * @return string json represented string
</span></span><span id="59" class="l"><span class="php-comment">     */</span>
</span><span id="60" class="l">    <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> encode() {
</span><span id="61" class="l">        <span class="php-keyword1">return</span> <span class="php-keyword1">array</span>(<span class="php-quote">&quot;__op&quot;</span> =&gt; <span class="php-quote">&quot;Increment&quot;</span>,
</span><span id="62" class="l">                     <span class="php-quote">&quot;amount&quot;</span> =&gt; <span class="php-var">$this</span>-&gt;value);
</span><span id="63" class="l">    }
</span><span id="64" class="l">
</span><span id="65" class="l">    <span class="php-comment">/**
</span></span><span id="66" class="l"><span class="php-comment">     * Apply operation on old value and returns new one
</span></span><span id="67" class="l"><span class="php-comment">     *
</span></span><span id="68" class="l"><span class="php-comment">     * @param mixed $oldval
</span></span><span id="69" class="l"><span class="php-comment">     * @return mixed
</span></span><span id="70" class="l"><span class="php-comment">     */</span>
</span><span id="71" class="l">    <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> applyOn(<span class="php-var">$oldval</span>) {
</span><span id="72" class="l">        <span class="php-var">$oldval</span> = <span class="php-keyword2">is_null</span>(<span class="php-var">$oldval</span>) ? <span class="php-num">0</span> : <span class="php-var">$oldval</span>;
</span><span id="73" class="l">        <span class="php-keyword1">if</span> (<span class="php-keyword2">is_numeric</span>(<span class="php-var">$oldval</span>)) {
</span><span id="74" class="l">            <span class="php-keyword1">return</span> <span class="php-var">$this</span>-&gt;value + <span class="php-var">$oldval</span>;
</span><span id="75" class="l">        }
</span><span id="76" class="l">        <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> \RuntimeException(<span class="php-quote">&quot;Operation incompatible with previous value.&quot;</span>);
</span><span id="77" class="l">    }
</span><span id="78" class="l">
</span><span id="79" class="l">    <span class="php-comment">/**
</span></span><span id="80" class="l"><span class="php-comment">     * Merge this operation into a (previous) operation.
</span></span><span id="81" class="l"><span class="php-comment">     *
</span></span><span id="82" class="l"><span class="php-comment">     * @param IOperation $prevOp
</span></span><span id="83" class="l"><span class="php-comment">     * @return IOperation
</span></span><span id="84" class="l"><span class="php-comment">     */</span>
</span><span id="85" class="l">    <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> mergeWith(<span class="php-var">$prevOp</span>) {
</span><span id="86" class="l">        <span class="php-keyword1">if</span> (!<span class="php-var">$prevOp</span>) {
</span><span id="87" class="l">            <span class="php-keyword1">return</span> <span class="php-var">$this</span>;
</span><span id="88" class="l">        } <span class="php-keyword1">else</span> <span class="php-keyword1">if</span> (<span class="php-var">$prevOp</span> <span class="php-keyword1">instanceof</span> SetOperation) {
</span><span id="89" class="l">            <span class="php-keyword1">return</span> <span class="php-keyword1">new</span> SetOperation(<span class="php-var">$this</span>-&gt;getKey(),
</span><span id="90" class="l">                                    <span class="php-var">$this</span>-&gt;applyOn(<span class="php-var">$prevOp</span>-&gt;getValue()));
</span><span id="91" class="l">        } <span class="php-keyword1">else</span> <span class="php-keyword1">if</span> (<span class="php-var">$prevOp</span> <span class="php-keyword1">instanceof</span> IncrementOperation) {
</span><span id="92" class="l">            <span class="php-keyword1">return</span> <span class="php-keyword1">new</span> IncrementOperation(<span class="php-var">$this</span>-&gt;getKey(),
</span><span id="93" class="l">                                          <span class="php-var">$this</span>-&gt;applyOn(<span class="php-var">$prevOp</span>-&gt;getValue()));
</span><span id="94" class="l">        } <span class="php-keyword1">else</span> <span class="php-keyword1">if</span> (<span class="php-var">$prevOp</span> <span class="php-keyword1">instanceof</span> DeleteOperation){
</span><span id="95" class="l">            <span class="php-keyword1">return</span> <span class="php-keyword1">new</span> SetOperation(<span class="php-var">$this</span>-&gt;getKey(), <span class="php-var">$this</span>-&gt;getValue());
</span><span id="96" class="l">        } <span class="php-keyword1">else</span> {
</span><span id="97" class="l">            <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> \RuntimeException(<span class="php-quote">&quot;Operation incompatible with previous one.&quot;</span>);
</span><span id="98" class="l">        }
</span><span id="99" class="l">    }
</span><span id="100" class="l">}
</span><span id="101" class="l">
</span><span id="102" class="l"></span></code></pre>

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